<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>V-on</title>
</head>

<body>
    <div id="app">
        <input type="button" value="v-on指令" v-on:click="doIt">
        <input type="button" value="v-on学习" @click="doIt">
        <input type="button" value="双击事件" @dblclick="doIt">
        <h1 @click="changeFood">
            {{food}}
        </h1>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {food:"土豆"},
            methods: {
                doIt: function () {
                    alert("哎呀");
                },
                changeFood:function(){
                    (console.log(this.food));
                    this.food+="好吃不上火"
                }
            },
        })
    </script>

</body>

</html>